- Critical Research Failure: In "Round Up the Usual Suspects" Macbeth has hidden camera footage stored on DVDs, yet the footage has tracking lines like on VHS.
- Crossover Ship: As a result of a joke from The Mysterious Mr. Enter's review, some fans have taken to shipping Macbeth with Awful B. Bad from Little Clowns of Happytown. Yes, you read that correctly.
- Ear Worm: Pretty much any song sung by Miss Macbeth is this, even if the lyrics are weird, the songs are just way too much fun to listen to.
- Evil Is Cool: Sadie Macbeth, for all of her delightful gnashing of the scenery and surprisingly well-done Tragic Villain characterization.
- Fridge Horror: In "Back to the Past" after discovering the true identities of INK, Macbeth goes back in time and wipes them each from existence one by one. Exactly how she erased them from existence isn't exactly made clear- Macbeth just mentions tracking down their parents!
- Germans Love David Hasselhoff: Zero is the show's most popular character in America, thanks to her being a tough goth girl with a soft side.
- Hilarious in Hindsight:
- White complexion, blue jacket, cyan eyes, most popular character? Seems like the cringey Sans humanizations have started leaking into the past...
- The second episode has Miss Macbeth using butterflies to mind control people. A villain who manipulates students using butterflies in a French cartoon? It seems like the writers unintentionally predicted Hawkmoth.
- Moe: Nearly all the students at Pinkerton qualify (Zero, Trixie, and Vin especially).
- Nightmare Fuel: Some of the straight-on shots of Macbeth smiling...
- Older Than They Think:
- Let's see, a group of kids band together and use homemade gadgets to fight adult tyranny. Now where have we heard that before?
- A French animated series about a group of kids at a boarding school who lead a secret double life fighting the forces of evil? With a kid genius and a girl associated with Asian culture as two members of said group? Nope, can't say that sounds very familiar.
- Tearjerker: Vin is an orphan and Zero ran away from home. Think about that for a minute.
- Viewer Gender Confusion: It's easy to mistake Zero for a boy until you realise she's wearing a skirt or a character mentions her gender.
YMMV / Invisible Network of Kids